Interplay of roughness/modulation and curvature for surface interactions at proximity
Employing the proximity approximation, we show that roughness or surface modulations change the distance dependence of (power-law) interactions between curved objects at proximity. The modified scaling law is simply related to the order of the first non-vanishing coefficient of the Taylor expansion...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
| Published: |
Institute of Physics Publishing
2014
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| Online Access: | http://hdl.handle.net/1721.1/88481 https://orcid.org/0000-0002-1112-5912 |
| Summary: | Employing the proximity approximation, we show that roughness or surface modulations change the distance dependence of (power-law) interactions between curved objects at proximity. The modified scaling law is simply related to the order of the first non-vanishing coefficient of the Taylor expansion of the distribution of separations between the surfaces. The latter can in principle be estimated by scanning measurements, or computed for well characterized modulations, and then used to predict short-distance scaling behavior in disparate experiments. For example, we predict that the radiative heat transfer between a rough sphere and a plate approaches a constant with decreasing separation. Similar saturation is expected for the Casimir force between dielectric or metallic surfaces with appropriate modulations over distinct length scales. |
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